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[Bug math/6794] ilogb() does not raise exceptions or set errno on domain errors
- From: "mtk dot manpages at gmail dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: 31 Jul 2008 09:48:02 -0000
- Subject: [Bug math/6794] ilogb() does not raise exceptions or set errno on domain errors
- References: <20080731094541.6794.mtk.manpages@gmail.com>
- Reply-to: sourceware-bugzilla at sourceware dot org
------- Additional Comments From mtk dot manpages at gmail dot com 2008-07-31 09:48 -------
Created an attachment (id=2856)
--> (http://sourceware.org/bugzilla/attachment.cgi?id=2856&action=view)
test program
Sample runs demonstrating problem. In no case is errno set. For the Inf and
-Inf cases, no exception is raised.
$ /tmp/mt_ilogb 0
errno == 0
fetestexcept() says: FE_INVALID FE_DIVBYZERO
ilogb(0.00000000000000000e+00)=-2147483648
0 FE_DIVBYZERO normal
$ /tmp/mt_ilogb nan
errno == 0
fetestexcept() says: FE_INVALID
ilogb(nan)=-2147483648
0 FE_INVALID normal
$ /tmp/mt_ilogb inf
errno == 0
fetestexcept() says:
ilogb(inf)=2147483647
0 0 normal
$ /tmp/mt_ilogb -- -inf
errno == 0
fetestexcept() says:
ilogb(-inf)=2147483647
0 0 normal
--
http://sourceware.org/bugzilla/show_bug.cgi?id=6794
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